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Finding the Fourth Proportional to 682.56, 1,023.20 and 422.56

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Solution

The fourth proportional to 682.56, 1,023.20 and 422.56 is: 633.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.56 : 1,023.20 = 422.56 : x
  2. Step 2: Convert to fraction form
    682.56/1,023.20 = 422.56/x
  3. Step 3: Cross multiply
    682.56x = 1,023.20 × 422.56
  4. Step 4: Simplify right side
    682.56x = 432,363.39
  5. Step 5: Solve for x
    x = 432,363.39/682.56
  6. Step 6: Final answer
    x = 633.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.